i have a 24 year old pinarello that still carves quickly and is rock solid at 60+km/hr.

mine you it is columbus steel so it is stiff and built to last.

the new carbon frames might fatique after a while.
great builders like Cervelo brag about their strength tests so that has to account for something.

many won't stress a frame like Thor can so normal wear shouldn't be an issue but my brother's aluminum Trek did crack at the headtube.

frames do come with warranties so check that out if you are a heavier rider.